<!DOCTYPE html>
<html lang="zh_CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>404</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            background-color: #a0eee1;
        }

        div {
            text-align: center;
        }

        div>h1 {
            position: relative;
            top: 200px;
            font-size: 50px;
        }

        div>input {
            position: relative;
            top: 300px;
            width: 100px;
            height: 40px;
            font-size: 20px;
        }

        div>input:hover {
            background-color: #31e4c6;
        }
    </style>
</head>

<body>
    <div>
        <h1>页面未找到！！！</h1>
        <input type="button" value="点击返回" onclick="back()">
    </div>
    <script>
        function back() {
            window.history.back(-1);
        }
    </script>
</body>
</body>

</html>